KR19980051095A - Method for measuring width distribution of roll gap in twin roll sheet metal casting process - Google Patents

Abstract

The present invention relates to a width direction roll gap distribution measuring method and a device therefor in a twin-roll thin sheet casting process. A method of measuring the width of roll width in an indirect manner by measuring displacement information, and installing each CCD camera at the edge of both rolls, and installing a light source generator at the bottom thereof, and the CCD camera is a CCD camera control device. The light source generator is connected to the light source generator control device, and the light source generation control device and the CCD camera control device are connected to the central processing computer and the high speed signal processing device for calculating the roll gap distribution, and at both sides of the center of the slit light. It is made by installing a knife edge.

Description

Method for measuring width distribution of roll gap in twin roll sheet metal casting process

The present invention relates to a method and apparatus for measuring widthwise roll gap distribution in a twin-roll thin sheet casting process. In particular, the roll gap distribution in the width direction can be measured online during a sheet casting process by a twin roll method, and thus the roll gap during casting Stable management and control of the, and also to minimize the thickness variations in the width direction and length direction of the sheet to be cast to produce a good quality product. In the prior art, there was no device capable of measuring the roll gap distribution online during the double roll type sheet casting process, and the method shown in FIG. It is not to measure the gap distribution, but to measure the roll gap at one point in the roll width direction. As described above, in the related art, in order to measure the roll gap at one point in the roll width direction, as shown in FIG. 1, the measuring device, that is, the roll gap detector 50 and the slit light generator 60, is used as the roll R and the roll. It had to be measured directly after installation between (R '). Therefore, it is impossible to directly measure the gap between the rolls during casting because the casting is performed in a state filled with water between the rolls R and R 'during thin sheet casting. In the conventional method, since the roll gap is measured only at one point in the roll width direction, it is not possible to simultaneously measure the width roll gap distribution.

The present invention has been made to solve the above problems in view of the above problems, and an object of the present invention is to provide a roll gap distribution measuring method and apparatus for measuring a width gap roll gap distribution during casting. A feature of the present invention having such a purpose is that the roll gap distribution device is not provided between the rolls and the rolls, but is installed on each side of both rolls so as to indirectly measure the width of the rolls in an indirect manner by measuring lateral displacement information of both rolls during casting. How to measure the gap, and each CCD camera is installed at the edge of both rolls, a light source generator is installed at the bottom thereof, the CCD camera is connected to the CCD camera control device, the light source generator is connected to the light source generator control device The light source generation control device and the CCD camera control device are connected to the central processing computer and the high speed signal processing device for calculating the roll gap distribution, while knife edges are provided on both sides of the center of the slit light.

1 is a configuration diagram of a conventional roll gap measurement device

2 is a roll gap measuring device configuration of the present invention

3 is a conceptual diagram for explaining a roll gap measuring method of the present invention;

* Explanation of symbols for main parts of the drawings

10: control device for light source generation

20: central processing computer for roll gap distribution

30: high speed signal processing device

40: CCD camera control device

C, C ': CCD camera

G, G ': Slit light generator

K, K ': Knife Edge

S, S ': slit light

The measuring apparatus of the present invention is not directly installed between the roll R and the roll R ', but is installed on both sides of the rolls R and R', respectively. Lateral displacement information was measured and the roll gap distribution in the width direction was measured indirectly. Here, in order to measure the roll side direction, CCD cameras C and C for detecting roll deflection in FIG. 1, knife edges K for limiting the range of roll displacement, and K ′ for roll measurement. A measuring device composed of wide silt light (S), (S ') is installed on both roll (R) and (R') sides, and both rolls (R), (R ') and respective knife edges ( The widths of the slit beams S and S ', which enter through K) and K', are measured by using the roll displacement detection CCD cameras C and C 'to measure the roll width directions, respectively. R), (R ') to measure the displacement in the width direction. The widthwise roll clearance distribution is calculated by the central processing computer 20 for calculating the roll gap distribution using the widthwise displacement information of the rolls R and R 'measured in this way. In this way, in order to effectively measure the gap distribution in the width direction, the slit light generators G and G 'generate wide slit light S and S' having a uniform width in the roll width direction. Should be. In this case, the light source uses monochromatic visible light, and the generated light source must be supplied in parallel light form. As shown in FIG. 2, in order to effectively measure the width of the slit light passing between the knife edge and the roll in the width direction, the optical systems of the detection CCD cameras C and C ′ have different magnifications in the width direction and the length direction. It must be specially manufactured with the optical system. That is, the roll side displacement can be precisely measured by using a high magnification in the width direction of the optical system, and the gap distribution in the roll width direction can be simultaneously measured by using a low magnification in the longitudinal direction of the optical system. In this device, the knife edges K and K 'are varied so that the roll displacement measuring range can be varied. In order to process a lot of measurement information at high speed in each measurement, a high speed signal processing apparatus 30 dedicated to image processing should be provided. When measuring width roll gap distribution using such a device, the numerical correlation of roll gap is as follows.

C = W-(a + b + 4R) .. (1) where a. Spacing between roll (R) and knife edge (K), b. Spacing between roll R 'and knife edge K', c. In the formula (1) above the gap between the roll (R) and the roll (R '), R. radius of each roll, W. gap between the front edge of the knife edge (K) and the knife edge (K') The width of roll gap can be easily obtained by using the measuring device for the value of, b.

The present invention as described above enables the online measurement of the roll gap distribution in the width direction during the thin roll casting process by the twin roll method, which enables stable management and control of the roll gap during casting, and also the width direction and the longitudinal direction of the sheet to be cast. By minimizing the thickness deviation of the product can be produced good quality.

Claims (2)

The width of the slit light entering between the edges of both rolls and the knife edge is measured using the CCD camera for roll displacement detection, and the roll gap measurement is calculated by using the width displacement information of both rolls and the width displacement information of the measured rolls. A process of calculating the width roll gap distribution in a central processing computer; and a process of processing the measured information measured by the process at high speed with a high speed signal processing apparatus dedicated to image processing at high speed; When measuring width roll gap distribution by using C = W-(a + b + 4R) where a. Gap between one side roll and knife edge, b. Gap between the other roll and the knife edge, c. Gap between rolls, R. Radius of each roll, W. Gap between front edge of one knife edge and other knife edge Method for measuring the width distribution of the roll width in the bi-roll type sheet casting process characterized by using. The CCD cameras C and C 'rolls are installed at the edges of both the rolls R and R', and the light source generators G and G 'are installed at the bottom thereof, respectively. C), (C ') is connected to the CCD camera control device 40, the light source generator (G), (G') is connected to the light source generator control device 10, and the light source generator control device (10) The CCD camera controller 40 is connected to the central processing computer 20 for calculating the roll gap distribution and the high-speed signal processing device 30, while the knife edge K is disposed at both centers of the slit light S and S '. ), (K ') in the width direction roll gap distribution measuring device in the twin-roll sheet metal casting process characterized in that the installation.